本文共 2011 字，大约阅读时间需要 6 分钟。

下面是后面链表相关题目中需要用到的链表结点的定义和相关操作函数，参见下面的list.h文件：

注意链表结点的定义采用cpp的定义方式，它会被cpp的文件调用。比如后面删除链表重复结点的文件del_repeated_list.cpp中的编译方式：

g++ -g del_repeated_list.cpp -o del_repeated_list

#include 
   
    #include 
    
     struct ListNode{    int value;    ListNode* next;};ListNode* CreateListNode(int value){    ListNode* pNode = new ListNode();    pNode->value = value;    pNode->next = NULL;    return pNode;}void ConnectListNode(ListNode* pCurrent, ListNode* pNext){    if(pCurrent == NULL){        printf("Error to connect two nodes.\n");        exit(1);    }    pCurrent->next = pNext;}void PrintListNode(ListNode* pNode){    if(pNode == NULL)        printf("The node is null.\n");    else        printf("The key in node is %d.\n", pNode->value);}void PrintList(ListNode* pHead){    ListNode* pNode = pHead;    while(pNode){        printf("%d\t", pNode->value);        pNode = pNode->next;    }    printf("\n");}void DestroyList(ListNode* pHead){    ListNode* pNode = pHead;    while(pNode){        ListNode* pNext = pNode->next;        delete pNode;        pNode = pNext;    }}void AddToTail(ListNode** pHead, int value){    ListNode* pNode = new ListNode();    pNode->value = value;    pNode->next = NULL;    if(*pHead == NULL)        *pHead = pNode;    else{        ListNode* pCurrent = *pHead;        while(pCurrent->next)            pCurrent = pCurrent->next;        pCurrent->next = pNode;    }}void RemoveHead(ListNode** pHead, int value){    if(pHead == NULL || *pHead == NULL)        return;    ListNode* pToBeDeleted = NULL;    if((*pHead)->value == value){        pToBeDeleted = *pHead;        *pHead = (*pHead)->next;    }else{        ListNode* pNode = *pHead;        while(pNode->next != NULL && pNode->next->value != value)            pNode = pNode->next;        if(pNode->next != NULL && pNode->next->value == value){            pToBeDeleted = pNode->next;            pNode->next = pNode->next->next;        }    }    if(pToBeDeleted != NULL){        delete pToBeDeleted;        pToBeDeleted = NULL;    }}
    
   

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